That could indeed produce a bad camber angle, but positive camber (top of wheels tilted out) is what you want. Did you have the angles checked, either at an alignment shop or with a magnetic angle gauge? As long as the bearings are properly adjusted, you can measure camber angle on the face of the hub after removing the grease cap. You should also measure the kingpin inclination (at the machined surface at either top or bottom of the spindle where the kingpin goes thru. The specs for a Chevy 1/2 ton or 3/4 ton are: Camber - 1 degree +/- 1/2 degree and Kingpin inclination: 7 deg 10 min +/- 1 min of angle. Should be the same for your GMC.
If the difference between kingpin camber angles isn't the same on both sides, then a spindle is bent and would have to be replaced. Bending the axle will change both camber and kingpin inclination. Check first before deciding the axle is bent.
Are you having issues with wheel alignment while driving?
